New diphenyl sulfones

ABSTRACT

New substituted diphenyl sulfones useful in reducing mortality and decreasing lesion incidence of poultry exposed to Marek&#39;&#39;s disease are disclosed.

llnited States Patent Shen et al.

[54] NEW DIPHENYL SULFONES [75] Inventors: Tsung-Ying Shen, Westfield; Wil- Iiam V. Ruyle, Scotch Plains; Michael W. Fordice, Clark; Norman P. Jensen, Watchung, all of NJ.

[73] Assignee: Merck & Co., Inc., Rahway, NJ.

['22] Filed: Sept. 17, 1970 [21] Appl. No.2 73,247

[52] U.S. Cl. ..260/397.6, 99/4, 424/248, 424/263, 424/273, 424/275, 424/278,

[51] Int. Cl ..C07c 147/06 [58] Field of Search ..260/397.6, 240 G 2,351,936 6/1944 Dohrn et al. ..260/397.6

FOREIGN PATENTS OR APPLICATIONS 491,265 8/1938 Great Britain ..260/397.6

OTHER PUBLICATIONS Dane et al. Angew, Chem. internat. Edit, vol. 1, page 658 (1962) Buttle et al., Biochem. J. vol. 32, pages 1101 to H10 (1938) Primary Examiner-John D. Randolph Att0rneyl. Louis Wolk, J. Jerome Behan and Hesna J. Pfeiffer [57] ABSTRACT New substituted diphenyl sulfones useful in reducing mortality and decreasing lesion incidence of poultry exposed to Mareks disease are disclosed.

1 Claim, N0 Drawings NEW DIPHENYL SULFONES SUMMARY OF THE INVENTION New substituted diphenyl sulfones of the following wherein R is a phenyl group; optionally substituted with chloro; hydroxy and loweralkoxy; hydroxy and chloro; or hydroxy substituent(s); or with a 3,4- methylenedioxy substituent; or a heterocyclic 5-6 membered ring containing l-2 hetero atoms selected independently from the group consisting of O, N, or S; or a branched alkyl group having 3-9 carbon atoms;

R is cycloalkyl having 3-9 carbon atoms, or halomethyl; said halomethyl having a methyl group having one, two, or three halogens, said halogens being the same or different and being chloro, bromo, fluoro, or iodo; or haloethyl, said haloethyl having 1-5 halogen atoms, being the same or different; loweralkenyl; a heterocyclic 5-6 membered ring containing 1-2 hetero atoms independently selected from the group consisting of O or N; or a thio-loweralkyl group having 1-6 carbon atoms; an aminohydrocarbyl fragment as hereinafter defined; or a phenyl group having a carboxy, amino, or nitro substituent;

R is also 2carboxyethel; and R is hydrogen, loweralkyl, branched alkyl, or -amino R 0:0 ll l CHaCHz0- =CH3CHzOHOCHiand R is hydrogen, loweralkyl, or loweralkoxy; R is hydrogen or loweralkyl; and R is hydrogen; the dotted line indicating that R, is not present when R is attached to C with a double bond; and R is phenyl having optional nitro, amino, methyl, or acetamido substituents or is loweralkyl having l-6 carbon atoms; and Z is also The compounds of Formula 1 (above) which are the sodium bisulfite and methanol adducts, i.e.,

OaNB

VIII

respectively, are also within the scope of this invention. By the term aminohydrocarbyl fragment" is meant that R, is a portion of an amino acid. For instance, if

represents an amino acid, the following amino acids can be used to make compounds of this invention.

i H2 0-6 0 H represents the amino acid, and R is therefore NHz or aminomethyl. One skilled in the art will easily identify the corresponding R aminohydrocarbyl fragment in the listed amino acids.

RsO

wherein each R is alkyl having 1-6 carbon atoms or hydrogen, are provided.

It is also our intention to disclose compounds which have the following formula:

wherein each Z is the same or different and is as defined above. In addition, compounds which are CHzCH:

NnSO;

OgNB

These sulfones are useful in reducing mortality and decreasing lesion incidence of poultry exposed to Mareks disease. In addition to the new compounds, compositions comprising the new sulfones as the active ingredient are provided.

Marek's disease is a highly infectious lymphoproliferative disorder of poultry, especially chickens. Mareks disease has also been known as neural leukosis, neuralymphomatosis, acute avian leukosis, and skin leukosis. The causative agent(s) are viral with a cell associated Herpes-type virus definitely implicated as an etiological factor. Mareks disease usually is clinically evident in birds prior to sexual maturity, i.e., before the first egg is laid. Clinical manifestations may be one or more of these signs: regional or generalized paralysis, diarrhea with fecal staining of posterior abdominal feathers, weight loss, dyspnea, blindness, enlarged abdomen, or death.

The lesions evident are non-necrotic and include one or more of the following; lymphocytic infiltrated peripheral nerves and/or feather follicles, lymphoproliferative foci, microscopic to several mm. in size, within any tissue of the body but principally within the liver, spleen, kidney, gonads, heart, proventriculus, breast muscle, skin, and nerves.

Mareks disease is estimated by the U. S. Department of Agriculture to cause a $200 million annual loss to the U.S. poultry industry. This loss is due to mortality and to the rejection of slaughtered bird carcasses as being unfit for human consumption. This rejection is due to the presence of the lymphoproliferative foci.

OBJECTS OF THE INVENTION It is an object of this invention to provide novel diphenyl sulfone compounds which have utility as agents useful in the treatment of poultry exposed to Mareks disease. It is a further object of this invention to provide a composition, which when administered orally to poultry, reduces mortality and decreases lesion incidence of poultry exposed to Mareks disease. It is a further object of this invention to provide a composition containing a specific level of novel diphenyl sulfone compounds which accomplishes the positive relief without adverse effects of residue or toxicity. It is a still further object of this invention to provide a composition containing novel diphenyl sulfone compounds which promote the growth of poultry when orally administered. It is yet another object of this invention to provide a new veterinary use for novel diphenyl sulfone compounds as a growth promotant of poultry. Other objects of the invention will be apparent upon further reading.

PREFERRED ASPECTS OF THE INVENTION The preferred novel compounds of this invention are those in which Z is More preferably, Z is when R, is a heterocyclic -6 membered ring having l-2 hetero atoms selected from the group consisting of O, N, or S. Preferably R, has one hetero atom, and is a pyrrolyl-, pyridinyl-, furanyl-, pyranyl-, thienyl-, or thiapyranyl-radical. The optimal compounds are those in which R is pyridinyl-, or thienyl-. Another preferred compound is that in which R is furanyl-.

Another group of preferred compounds of this invention are those in which R is a phenyl group, or a substituted phenyl group, the substituent(s) on the phenyl group being chloro-, or hydroxy and loweralkoxy, or chloro and hydroxy. These substituent(s) can be located anywhere on the phenyl moiety. The most preferred R is a phenyl substituted with hydroxy and lower alkoxy. By the term loweralkoxy is meant a group having 1-6 carbon atoms. The most preferable loweralkoxy group is methoxy. The optimal compound is 4-(2-hydroxy-3-methoxybenzilidene)-4'-ureidodiphenyl sulfone, 4-(3-methoxy-4-hydroxy-benzilidene)-4-ureido-diphenyl sulfone, or 4-(2-chlorobenzilidene)-4-ureido-diphenyl sulfone.

As discussed above, the sodium bisulfite or methanol adducts of the compounds where Z is are included within the scope of this invention. Particuis that in which R is a phenyl group having a methylene-dioxy substituent at 3,4. This compound, and the sodium sulfite and methanol adducts, are useful also against Mareks disease.

Another group of preferred compounds of this invention are those in which Z is O H Rr Most preferably, R, is a trifluoromethyl group. The optimal compound is 4-trifluoroacetamid0-4'- ureidodiphenyl sulfone.

Yet another group of preferred compounds when Z O k RQ-i J-M- are those in which R, is a cycloalkyl group having 3-6 carbon atoms. Included arethe cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl moieties. The most preferred compounds are those in which the cycloalkyl group is cyclohexyl or cyclobutyl.

Another compound that is preferred when Z is is that in which R is chloromethyl-; this compound is known as 4-chloroacetamido-4'-ureido-diphenyl sulfone. R, can also be a haloloweralkyl group, wherein loweralkyl has 1-6 carbon atoms.

Still another group of preferred compounds when Z IS EPA-N- are those in which R is a heterocyclic 5-6 membered ring containing one hetero atom. The hetero atom is O or N. Preferred heterocyclic moieites are, for example, furan, pyrrole, pyran, and pyridine. Most preferred is 4- furoylamino-4-ureido-diphenyl sulfone. Another compound is 4-pyridinoylamino-4'-ureido-diphenyl sulfone.

Yet other preferred compounds in this series, where Z is are those in which R is an aminohydrocarbyl fragment selected from the group consisting of aminomethyl, lamino-2-phenylethyl, and 1-amino-2-carboxyethyl. Another preferred compound is that in which R is 2- carboxyethyl.

A third major group of compounds of this invention are those in which Z is It is apparent that soluble non-toxic salts and alcoholate solvates of all of the above compounds are also included within the scope of the invention.

The novel diphenyl sulfones of this invention are generally prepared by a condensation reaction of 4- (sulfanilyl)phenyl urea with an appropriate reactant.

To prepare compounds of the type when Z is WhenZis the corresponding Ra -halide preferably chloride, is used. This reactant can generally be described as the acid halide or chloride, and the corresponding acid anhydride is also suitable. The amino acid can also be used when R, is an aminohydrocarbyl fragment as defined supra.

Whether the acid, acid halide, or acid anhydride is used, these reactants are each employed in approximately equimolar quantities with the sulfaguanidine. A solvent is employed, for instance, acetone, N,N- dimethylformamide, pyridine, trifluoroacetic anhydride and others. The temperature of the reaction can be from ambient to 150C. and is preferably at room temperature to 90C. The product can generally be recovered as a solid precipitate, or by evaporation of the solvent. The reaction goes to completion within 30 minutes to hours.

When the final sulfone compound contains a ring substituent, the process used employs a substituted 4- amino-4'-halo-diphenyl sulfone in reaction with urea. The reactants are mixed in approximately equal molar proportions, in a solvent such as ethanol, methanol, tetrahydrofuran, or the like, and mixed at temperatures ranging from 20-125C.

The substituted methylene compounds can be generally prepared by reacting 4'-amino-4-ureidodiphenyl sulfone, formaldehyde, and the desired organic compound containing the R group linked to active hydrogen-containing group, such as H or OH. The three reactants are employed in generally equimolar amounts, and are condensed following the general reaction conditions described above. Other compounds can be prepared using modifications of this procedure. The general process conditions and reactants used to prepare the novel sulfones of this invention are familiar to one skilled in the art. Generally, the structural formula above of the sulfones of this invention is sufficient information to enable one skilled in the art to prepare the compound. Selection of the reactants and process conditions is deemed to be within the expertise ofthose working in the field today.

Compounds in which 2 is a phosphorus acid-containing moiety are prepared by condensing the diphenyl sulfone and the appropriate phosphorus acid in a suitable solvent in approximately equimolar amounts. Reaction of the phosphorus acid with the N-amino group can be assured by selectively blocking the other reactive amino functionalities, and subsequently removing them or by choice of reaction conditions such that substantially 1:1 reaction at the N-nitrogen is achieved.

The compounds when Z is any other listed moiety are prepared generally as discussed above, using an appropriate reactant. For instance, the compound 4-(2- nitrophenylsulfenyl)-4'-ureido-diphenyl sulfone, is prepared by reacting 2nitrophenylsulfenylchloride with 4-(sulfani1yl)phenyl urea.

The compound, 4-(l-methyl-l,2-butenyl-3-one)- amino-4'-ureido-diphenyl sulfone, is prepared by reacting 4-(sulfanilyl)phenyl urea with 2,4-pentanedione. An optional solvent such as methanol, ethanol, or tetrahydrofuran is employed. The reaction can also be conducted in an excess of the 2,4-pentanedione. An acidic catalyst, such as toluenesulfonic acid or 2,4- dinitrobenzene sulfonic acid, can also be employed if desired. The reactants are heated at room temperature at C. for 2-15 hours.

The compound, 4- (dimethylaminomethyleneamino)-4'-ureido-diphenyl sulfone, is prepared by acid hydrolysis of N- dimethylaminomethylene-N -[4-(pdimethylaminomethyleneaminosulfonyl)phenyl]-urea. The latter compound is obtained by reacting dimethylformamide and p-sulfanilylphenyl urea in the presence of phosphorus oxychloride.

The compound, 4-benzylamino-4'-ureido-dipheny1 sulfone, is prepared by first'reacting dibenzylphosphite and N-bromosuccinamide and then adding this reaction product to 4-(sulfanily1)phenyl urea in an organic solvent. The reactions all proceed at room temperature.

The compound, 4-(B-carboxy-B- acetylaminoethylthiomethylamino)-4'-ureido-dipheny1 sulfone, sodium salt, is prepared by reacting cysteine and 4-(sulfanily1)phenyl urea in the presence of formaldehyde following the same general condensation process conditions.

The compound, 4-cinnamylidene-4'-ureido-diphenyl sulfone, is prepared as are the Schiffs base-type compounds by the reaction of cinnamic aldehyde and 4- (sulfanily1)phenyl urea.

Novel diphenyl sulfones of the type disclosed above are effective in the treatment and control of Mareks disease. The compounds effectiveness is tested in vivo by employing chickens which have been infected with virus containing lymphoblasts originally obtained from a chicken with a typical case of Mareks disease. The test procedure is as follows: Athens-Canadian (A-C) random bred chicks, in groups of five each, were placed in cages with wire floors. They were fed ad libitum a standard poultry ration in which concentrations of the sulfones were blended just prior to use. Normal and infected control birds were fed basal ration containing no test compound. After 24 hours on medication, the chicks were injected with a challenge inoculum of Mareks disease virus. The inoculate was originally obtained from a typical field case of Mareks disease in commercial broilers. The inoculate characteristically produces lymphoid tumors of the liver, spleen, kidney, and gonads.

The oral medication in the feed is continued throughout the experiment as a stated percentage of the diet. After an appropriate experimental period, wherein over 50 percent of the non-medicated infected controls succumb, all surviving birds are sacrificed. All dead and sacrificed birds are autopsied and lesion incidence recorded.

In accordance with this invention, the novel diphenyl sulfones are employed for controlling Mareks disease by administering them to poultry susceptible or exposed to the disease, either in the drinking water, feed, or parenterally. The preferable mode of administration is orally, either in the drinking water or feed.

It is most preferred to disperse the diphenyl sulfone in the finished feed of the animals, and to administer the medicated feed ad libitum to the birds. Good results against Mareks disease are achieved with feedstuff containing from about 0.002 to 0.1 percent by weight of the drug. Drug levels can also operably be from 0.0002 to 0.2 percent in the feed. The preferred range is between 0.01 to 0.1 percent in the feed. Levels in poultry feed are here expressed in terms of percent by weight concentration. The higher levels may be used in treating an established outbreak of Mareks disease, but the higher dosages are not preferred for prophylactic treatment where medicated feed is given continuously to the poultry. It will be appreciated by those skilled in this art that these low levels will eliminate any toxicity or residue problems which result from feeding of high levels of the diphenyl sulfone.

The finished feed in which the above-described levels of the novel diphenyl sulfones are employed is a nutritionally adequate one containing sources of carbohydrate, protein, fat, vitamins, minerals and other nutritional factors commonly employed in commercial poultry raising. In addition, other poultry feed additives such as coccidiostats, e.g., amprolium, ethopabate, nicarbazin, can be employed in the compositions.

In addition to administration via the solid feedstuff, diphenyl sulfones can be administered to poultry by incorporation in the drinking water. The preferred dose levels in the drinking water are usually somewhat less than those employed in a solid feed inasmuch as poultry drink about twice as much as they eat. The operable level in drinking water is from 0.0001 to 0.1 percent by weight of the diphenyl sulfone compound and the preferred range is 0.005 to 0.1 percent by weight. Administration via the drinking water is of advantage when using the compound therapeutically rather than prophylactically. For this purpose it is convenient to prepare dispersible or water-soluble powders in which the diphenyl sulfones are intimately dispersed in a suitable water-soluble or dispersible liquid or solid carrier such as dextrose, sucrose, dimethyl sulfoxide, or other suitable non toxic carriers, at concentrations of from about 0.03 percent to about 25 percent by weight. These solids may then be conveniently added to the drinking water by the poultry grower.

A typical drinking water formulation contains 4- (thenylidene-Z)4-ureido-diphenyl sulfone, 0.3%; l- (2-n-propyl-4-amino-5-pyrimidinyl-methyl)-2-methyl pyridinium chloride hydrochloride, 9.6%; dextrose, 30%; propylene glycol, 20%; dimethylpolysiloxane, 0.002%; polyoxyethylene sorbitan monoleate, 0.2%; water, to

According to a further aspect of this invention, there are provided compositions comprising poultry feed supplements or additives containing the diphenyl sulfones previously described as an effective Mareks disease agent. In such compositions the compound is mixed with or dispersed in an orally ingestible carrier vehicle that is non-toxic to the poultry and compatible with the finished feedstuff. These feed supplements contain a significantly higher percentage of the novel diphenyl sulfone compounds than does the finished feed, and are mixed with or blended into the feedstuff before administration to the poultry. In order to assure uniform distribution of the compound in the finished feed, it is customary to employ an intermediate dilution step in which the: supplement is blended with a portion of the final feed, and this intermediate mix" is then added to the remainder of the feed with adequate mixing. The diphenyl sulfones described hereinabove may be formulated into feed supplement compositions containing from about 0.05 percent to about 50 percent by weight of drug. It is preferred in the industry to use from about 1-5 pounds of such a supplement per ton of feedstuff. It will, therefore, be appreciated that the preferred supplement concentration will depend to a large extent on the final use level desired. With the compounds of this invention, feed supplement compositions containing from about 1.0 percent to about 20 percent by weight of active ingredient are preferred.

Diluent or carrier vehicles that may be used in these poultry feed supplements are solid orally ingestible poultry feed additives such as corn meal, distillers dried grains, ground oyster shell, citrus meal fermentation residues, wheat shorts, wheat middlings, molasses solubles, corn gluten feed, soybean meal, dehulled soya flour, crushed limestone, fermentation mycelia, edible vegetable substances and the like. Nutritive carriers are preferred since the finished feed is benefitted thereby.

It will be apparent to one skilled in the art that when we use the term substituted diphenyl sulfone" we mean compounds which can also be named as derivatives of 4-(sulfanilyl)phenyl urea. The sulfanilyl portion of the molecule is product, 4-(pyridinylidene-2)-4'-ureido-diphenyl suland the phenyl and urea portions are self-explanatory. fone, methanol adduct, identified by nuclear magnetic When the latter system of nomenclature is used, the resonance (NMR). The adduct decomposed while novel compounds of this invention are named as the N- being heated, so that no melting point could be obsubstituents. For instance, the compound described in tained. Example 1, 4-(furanylidene-2)-4-ureido-diphenyl sulfone can also be named 4-[N-(furanylidene-2)- sulfanilyllphenyl urea. The other compounds can be EX AM PLE 5 4-(Pyranylidene-3 )-4'-ureido-diphenyl sulfone,

named accordingly.

This invention will be more fully described in the folmethanol adduct |owing examples. Using the procedure of Example 4, pyran-3-carboxaldehyde is reacted with 4-(sulfanilyl)phenyl urea. The EXAMPLE 1 product, 4-(pyranylidene-3)-4'-ureido-dipheny1 sul- 4-(Furanylidene-2)-4 -ureido-diphenyl sulfone l5 fone methanol adduct ls recovered 1.5 G. of furan-Z-carboxaldehyde is dissolved in 50 EXAMPLE 6 ml. of ethanol and 2.1 g. of 4-(sulfanilyl)phenyl urea is added. The solution is boiled to concentration to a y p y sulfone. sodium volume of ml., then cooled. A precipitate forms durb sulfite adduct ing the concentration and is collected and washed with 8'0 Millimoles of thiophene 2 carb0xa|dehyde and 5 ethanol kegystamzafion of the solid 9 millimoles of NaHSO are heated with 5 millimoles of methanol ylelds the product 4'(furanyhdene'2)'4 4-(sulfanilyl)phenyl urea in 10 ml. of water on a steam ureido'diphenyl sulfone 188L1900C' bath for 10 minutes. During this time, an additional 5.0 EXAMPLE 2 millimoles of thiophene-2-carboxaldehyde is added.

The mixture is then cooled and insolubles are removed 4-(Thenylidene-2)-4-ureido-diphenyl sulfone by filtration. The filtrate is concentrated to a solid by freezing and then drying under vacuum (freeze-drying"). Purification is achieved by dissolving in methanol and reprecipitating with ether. The product, 4-(thenylidene-2)-4-ureido-dipheny1 sulfone, sodium A 1.2 g. portion of thiophene-Z-carboxaldehyde is dissolved in 50 ml. of ethanol and 2.00 g. of 4- (sulfanilyl)phenyl urea is added. The solution is boiled down to 15 and cooled The resultant preclpltate bisulfite adduct is recovered having a melting point of collected washed with hot ethanol. Recrystallization o l 17 C., dec. The compound 18 fully identified by means from ml. of methanol gives the product, 4-(theny- OfNMR techniques lidene-2)-4-ureido-diphenyl sulfone, m.p. 220-222 C. 35 EXAMPLES 720 EXAMPLE 3 The following Examples 7-20 are summarized and I i tabulated in Table I. Examples 7, 9, and 14 through 17 'ure'do'dlphenyl sulfone are the sodium bisulfite adducts of the indicated Using the Same procedure f Examples 1 and 2 40 products and are prepared following the procedure of role-3-carboxaldehyde is reacted with 4-(sulfanilyl) Example EXa mP|eS 8 and 10 through 13 are the phenyl urea. The product, 4-(pyrrolidene-3 )-4'-ureido- Subst'tuted Sch'ff base-type compounds P p diphenyl sulfone is recovered. lowing the procedures of Examples 1 or 2. Examples 18 through 20 are the methanol adducts of the indicated EXAMPLE 4 products and are prepared following the procedure of Example 4.

4-(Pyridinylidene-2)-4-ureido-diphenyl sulfone,

methanoladduct These compounds were all identified by use of nuclear magnetic resonance techniques. Melting points 2.0 G. of pyridine-2-carboxaldehyde is dissolved in of the indicated compounds were not obtainable, due 75 ml. of ethanol and 2.9 g. of 4-(sulfanilyl)phenyl urea to the decomposition of the compound under heat.

TABLE 1.-ExAMi ias 7-20 Example No. Product obtained Starting aldehyde M.P. of product 7 4-(l'urany1ldene-2)-4-11reido-diphel1yl sulfone, NaHSO; adduct Furan-2-carb0xaldehyde Not obtainable. 8 4-(benzilidene) 4-ureidodipheny1 sulfone Benzaldehydc 223-225.5 C.

9.. 4-(benzilidene)-4-ureido-diphenyl sulfone, NaHSOs adduct.. ..do Not obtainable. 10. 4-(2-hydroxy-3-mothoxy banzilitlono)-4'-ureido-dlphenyl sulfone. -OlI-3-0ClI benzaldehydo 210212 C.

11.. 4-(2-hydroxy-s-chlorohonzilidcnc) 4-ureido-diphcnylsulfone 2-0l1-5-Cl-benzaldehyde.... 201-204 (1,

12.. t-(d-clilorobonzilidono)-4-uroi(lo-(1iphmlyl sulfone 4-Cl-bcnzaldohyde 103-110 (J. (loo. 13-. 4-(3,4-methylcnedioxylionzllitloim) 4-i1reid0-(1lphcnylsulfone 3,4-motliylonodioxylmnzaldohyde. 231-233 C.

14 4-(2-oh1orobeiizilidono)-4-ureitlo-tliphonyl sulfone, NallSOnaddtlct Z-Cl-lmnzaldcliydu Not obtainable. 15 4-(3-met1l0xy-4-l1ydr0xyb0112111(10I10)4 -1ll01(10-(11[ ll0l1y1SullOlll, NuIISOuulducL. 3-00[1 -4-0I[-lmnzaldohy(le D 16.. 4-(3,4-mcthy1tmcdi0xylmnzilidono)-4-urol(lo-diphonylsulfone, N111ISO3i1(1(1l1C1; 3,4-mothyloncdioxyhonzaldehydo... D0.

18.. 4 (honzilidone)-4-uroi(lo-(1ipllenyl sulfone, methanol adduct Botizaldullytleu Do.

20 4-(2-11ydr0xy-4-o1110robonzllldonu)4'-uroid0-diphenyl511110110, methanol a 1tluct.... 2-0H-4-Cl-benzuldeliyde Do.

15 added. After concentrating the solution to 15 ml., at EXAMPLE 21 precipitate forms and is collected. This precipitate is washed with ethanol and then dissolved in 50 ml. of methanol. Evaporation of the methanol yields the solid A suspension of 2.9 g. (10 mmoles) of 4- 4-Trifluoroacetamido-4'-ureido-diphenyl sulfone (sulfanilyl)phenyl urea in 20 ml. of trifluoroacetic anhydride is stirred overnight at room temperature. The precipitated solid is removed by filtration at the end of the reaction, washed with ether, and recrystallized from methanol-water to give the product, 4- trifluoroacetamldo-4'-ureido-diphenyl sulfone, m.p. 180C., (softening and decomposition) 200C. (all melted).

EXAMPLE 22 4-Chloroacetamido-4'-ureido-diphenyl sulfone To a suspension of 11.6 g. of 4-(sulfanilyl) phenyl urea in 200 ml. of water containing 2 g. of sodium hydroxide, is added 25 ml. of chloroacetylchloride. The reaction mixture is stirred at room temperature for one hour at which time thin layer chromatography shows no presence of the starting material. The product is recovered from the reaction mixture by filtration and purified by recrystallization in methanol-water. The product, 4-chloroacetamido-4-ureido-diphenyl sulfone, is recovered as the hemi-hydrate, m.p. 195-197 C.,dec.

EXAMPLE 23 4-Cyclohexanoylamino-4-ureido-diphenyl sulfone To a warm solution of 2.91 g. of 4-(sulfanilyl) phenyl urea in 10 ml. of pyridine is added 1.1 1 g. of cyclohexanecarbonyl chloride. The mixture is heated on a steam bath for 15 hours and an additional 1.1 g. of the chloride is added. After 5 more minutes of warming, the mixture is cooled and diluted with 140 ml. of water. A viscous oil is separated. The supernatant is decanted and replaced with more water. After stirring overnight, the oil is solidified and is collected on a filter. The solid is dissolved in 100 ml. of acetone, the solution is filtered to remove insolubles, and concentrated to 50 ml. The solution is then cooled. A precipitate is recovered which is pure by thin layer chromatography analysis. The product, 4-cyclohexanolyamino-4'-ureido-diphenyl sulfone is identified by NMR, m.p. 140-145C.

EXAMPLE 24 4-Cyclobutanoylamino-4-ureido-diphenyl sulfone Using the same process as described in Example 23, 4-(sulfanilyl)phenyl urea and cyclobutanecarbonyl chloride are reacted. The product, 4-cyclobutanoylamino-4'-ureido-diphenyl sulfone, has a melting point of 100C. with decomposition. The product was identified using NMR.

EXAMPLE 25 4-Furoylamino-4-ureido-diphenyl sulfone A 2.0 g. portion of 4-(sulfanilyl)phenyl urea is dissolved in ml. of pyridine and 0.99 g. of furoyl chloride is added. The mixture is heated in a steam bath for hours. After cooling, 140 ml. of water is added. A dark oil separates which solidifies on standing to give 2.65 g. of solid. This material is then dissolved in ml. of methanol and the solution is filtered. Water is added until cloudiness is obtained, and the mixture is concentrated by heating under a stream of nitrogen. The residue, after purification, yielded the product, 4-furoylamino-4'-ureido-diphenyl sulfone, m.p. 138-145 C.

EXAMPLE 26 4-Nicotinoylamino-4'-ureido-diphenyl sulfone A 2.00 g. portion of 4-(sulfanilyl)pheny1 urea is dissolved in 8 ml. of pyridine and 1.71 g. of nicotinoyl chloride hydrochloride is added. The mixture is warmed on a steam bath for 5 minutes. After cooling, 25 ml. of water is added slowly and the resultant precipitate is collected on a filter. After washing successively with water and hot methanol, 1.20 g. of product, 4-nicotinoylamino-4'-ureido-diphenyl sulfone, is obtained, m.p. 22022 l .5C.

EXAMPLE 27 4-Pyroyl-4-ureido-diphenyl sulfone Using the same process as in Example 26, 4- (sulfanilyl)pheny1 urea and pyroyl chloride are reacted. The product, 4-pyroyl-4'-ureido-diphenyl sulfone, is recovered.

EXAMPLE 28 4-Pyrroloyl-4'-ureido-diphenyl sulfone Using the same process as in Example 26, 4- (sulfanilyl)phenyl urea and pyrroloyl chloride are reacted. The product, 4-pyrroloyl-4'-ureido-diphenyl sulfone is recovered.

EXAMPLE 29 4-Aminomethylcarbonylamino-4-ureido-diphenyl sulfone The amide prepared in Example 22, 4-

chloroacetamido-4-ureido-diphenyl sulfone, (5 g.) is dissolved in 250 ml. of concentrated ammonium hydroxide and 250 ml. of ethanol and heated at reflux for 2.5 hours. The ethanol is then removed by evaporation at reduced pressure. The residue is a semi-solid mass which is not filterable. After drying, a solid product is obtained which is then washed with water. The final product, 4-aminoethylcarbony1amino-4'- ureidodiphenyl sulfone, m.p. 240-245dec., is analyzed and identified as the hydrate form.

EXAMPLE 30 4-(a-Amino-B-phenylpropionylamino)-4-ureidodiphenyl sulfone To 2.91 g. of 4-(sulfanilyl)phenyl urea dissolved in 20 ml. of dry pyridine is added with stirring 3.2 g. of phthalyl-L-phenylalanylchloride [J.A.C.S. 74, 38-2 1952 A c siEEe Bm begins to form after a few minutes. After a few hours, water is added to complete crystallization. The crude product is collected on a filter and washed well with water to yield 4.51 g. A portion crystallized from methanol and has a melting point of 175dec. This product is identified as the intermediate: 4-[4-(phthalyl-L-phenylalanylamino)phenylsulfonyHphenyl urea.

A mixture of 1.14 g. (0.002 mole) of 4-[4'-(phthalyl- L-phenylalanylamino)phenylsu1fonyl]phenyl urea and 0.15 g. (0.003 mole) of hydrazine hydrate in 20 ml. of ethanol is heated at reflux temperature for 3 hours. The reaction mixture is concentrated under reduced pressure to leave a solid residue. It is then extracted with 10 percent potassium hydroxide solution to remove phthalylhydrazide, a by-product of the reaction. The alkaliinsoluble material is washed with water and ethanol and dried, yield 0.79 g. A 0.26 g. sample is crystallized from dimethyl sulfoxide and water. There is obtained 0.13 g., m.p. 235-240 (dec.), of the product, 4-(aamino-B-phenylpropionylamino)-4-ureido-diphenyl sulfone. Thin-layer chromatography indicates a single component. Analytical data as well as NMR and IR spectra are consistent for the assigned structure.

EXAMPLE 31 4-Aspartylamino-4-ureido-diphenyl sulfone A 5.82 gram portion of 4-(sulfanilyl)phenyl urea is dissolved in 50 ml. of dimethylformamide, the solution is cooled with an ice bath and 4.12 grams of dicyclohexylcarbodiimide is added. The mixture is cooled and stirred, and a solution of 6.22 grams of tbutyl-L-aspartic-4-benzyl ester in 50 ml. of ethyl acetate is added in 2 minutes. After stirring 15 hours under a nitrogen atmosphere at room temperature, the insoluble precipitate is removed by filtration and the filtrate is concentrated in vacuo to =30 ml. volume, which is washed with 100 ml. of ether. The residual gum is extracted with 100 ml. of chloroform. The chloroform-soluble material is chromatographed in 150 grams of silica gel, yielding 1.2 grams of 4-[N-(obenzyl-5-butoxycarbonylamineaspartyl)- sulfanilyl1phenyl urea, which was pure by TLC but contained residual chloroform, m.p. -95-1 15C.

A 800 mg. portion of 4-[N-(o-benzyl-t-butoxycarbonylamineaspartyl)sulfanilyl]phenyl urea is hydrogenated in 40 ml. of ethanol in the presence of 80 mg. of a catalyst percent palladium in carbon) at atmospheric pressure. Removal of the catalyst by filtration and concentration of the filtrate under a stream of nitrogen gives a residue which crystallizes on trituration with ether to give 4-[N-(t-butyloxycarbonylaspartyl)sulfanilyl]phenyl urea, which is pure by TLC and NMR, but contains ether as a solvent, m.p. -l50 -l70C.

A 420 mg. portion of 4-[N-(t-butyloxycarbonylaspartyl)sulfanilyl1phenyl urea is dissolved in 5 ml. of dimethoxyethane, and the solution is cooled in an ice bath before being saturated with hydrogen chloride gas. After standing hours at room temperature, the solvent is removed in vacuo and triturated with ether to give 0.29 grams of 4-aspartylamino-4-ureido-diphenyl sultone hydrochloride which is pure by TLC and NMR, but contains solvent, m.p. 75C.

EXAMPLE 32 4-(B-Carboxypropionylamino)-4'-ureido-diphenyl sulfone A mixture of 2.9 grams of 4-(sulfanilyl)phenyl urea, 1.0 gram of succinic anhydride, and 60 ml. of methylethyl ketone is heated at reflux for 17 hours.

After cooling, the crystalline product is filtered and washed with methylethyl ketone and with ether. Yield: 2.9 grams of sample, recrystallized from methanolether, m.p. 145l50C. dec. Analysis shows the material to be the hemihydrate of 4-(B-carboxypropionylamino)-4-ureido-diphenyl sulfone. The material is homogeneous by thin-layer chromatography (TLC) and shows an NMR spectrum consistent with the above structural formula.

EXAMPLE 33 4-(Dimethylaminomethyleneamino)-4'-ureidodiphenyl sulfone To 20 ml. of dry dimethylformamide in an ice bath is added 2.56 ml. of phosphorous oxychloride during five minutes. To the resulting solution is added 4.0 g. of psulfanilylphenyl urea which dissolves immediately. A precipitate subsequently forms and after 2 hours at room temperature, the solid is removed by filtration and washed with dimethylformamide and with ether. This solid is taken up in 100 ml. of cold water, the solution filtered, and the filtrate brought to pH 8 with aqueous sodium hydroxide. The product is filtered, washed with water, and dried in vacuo. Yield of the intermediate N-dimethylaminomethylene-N -[p- (dimethylaminomethylenesulfanilyl)phenyl]urea is 3.85 g., m.p. (from methanol) 20020lC. Analysis, NMR, and infra-red spectra are consistent with the assigned structure.

7 A mixture of 300 mg. of N-dimethylaminomethylene N [4 (p dimethylaminomethyleneaminophenylsulfanilyl)phenyl]urea and 3.0 ml. of 2.5 N hydrochloric acid is heated at about C. (Steambath) for 20 minutes. The mixture is cooled, filtered, and the crystalline product washed with cold 2.5 N- hydrochloric acid, ethanol, and with ether to yield 250 mg. A sample is recrystallized from methanol for analysis, and indicates that the product is 4-(dimethylaminomethyleneamino) 4 ureido diphenyl sulfone. The material is homogeneous by TLC and shows an NMR spectrum consistent with the structure.

EXAMPLE 34 4(B-Carboxy-B-acetylaminoethylthiomethylamino)-4'- ureido-diphenyl sulfone, sodium salt, dihydrate To 2.91 g. (0.01 mole) of 4-(sulfanilyl)phenyl urea suspended in 33 ml. of ethanol are added 1.5 ml. of 36 percent formaldehyde solution, 1.8 g. (0.011 mole) of N-acetyl-L-cysteine and three drops of concentrated hydrochloric acid. After 2% hours, some oily sticky material separates. The reaction mixture is filtered through sintered glass. To the filtrate is added a solution of sodium ethoxide in ethanol until precipitation ceases. At this point, the supernatant liquid has a basic pH. The precipitated product is collected and washed well with ethanol and ether. After drying in vacuo over potassium hydroxide, the material weighs 2.66 g., m.p. 205-2l0 (dec.). Thin-layer chromatography indicates a single component, and analysis shows a dihydrate. The compound is identified as 4-(B-carboxy- B-acetylamino-ethylthiomethylamino)-4'-ureidodiphenyl sulfone, sodium salt dihydrade, and NMR and IR spectra are consistent with this structure.

EXAMPLE 35 4-Benzylamino-4-ureido-diphenyl sulfone 6.0 Grams ofdibenzylphosphite is added to 50 ml. Of benzene and 3.2 grams of N-bromosuccinamide. After 1 hour, insoluble material is removed by filtration, and the filtrate is concentrated in vacuo to an oil which is dissolved in 30 ml. of carbon tetrachloride. This solution is added dropwise to a stirred mixture of 2.91 grams of 4-(sulfanilyl)phenyl urea and 100 ml. of benzene. After stirring 2% days, a brown gum is collected and extracted with 70 ml. ,of 4:1 chloroform: methanol. This extract is chromatographed twice on silica gel using 4:1 chloroform:methanol as an eluant. The front-running fraction yields one-half gram, which is recrystallized from methanol to give 0.25 grams of 4- benzylamino-4-ureido-diphenyl sulfone, m.p. 239-240 EXAMPLE 36 4-Cinnamylidene-4-ureido-diphenyl sulfone 4.82 Grams of 4-(sulfanilyl)phenyl urea is dissolved in 200 ml. of hot methanol and 4.2 grams of cinnamic aldehyde is added. The mixture is concentrated to 50 ml. and, after standing hours, 3.3 g. of material is collected, which is partially recrystallized from 125 ml. of methanol to give 2.6 grams of 4-cinnamylidene-4'- ureido-diphenyl sulfone, m.p. 200202C.

This bis-sodium bisulfite adduct of this compound can be prepared by warming on'a steam bath 2.03 g. of 4-cinnamylidene-4'-ureido-diphenyl sulfone and 1.05 g. of sodium bisulfite in 10 ml. of water. Insolubles are removed by filtration; the filtrate is dried to a residue and recrystallized from methanol/ether. The product,

EXAMPLE 37 4-(2-Nitrophenylsulfenylamino)-4-ureido-diphenyl sulfone A mixture of 2.0 g. of 4-(N-sulfanilyl)phenyl urea, 0.71 g. of triethylamine, 1.3 g. of 2-Nitrophenylsulfenyl chloride, and .73 g. of triethylamine were stirred overnight in 250 ml. of acetone. The mixture is stirred 2 more days with the addition of four 1.3 g. portions of 2- nitrophenylsulfenyl chloride and 0.71 of triethylamine. Insoluble material is removed by filtration and the acetone is removed in vacuo. The residue is washed with two 200 ml. portions of hot ether and then extracted with 50 ml. of acetone. The acetone extract is concentrated to a gum which is extracted with 50 ml. of chloroform. The chloroform extract is chromatographed on 100 g. of silica gel using 1 percent methanol in chloroform. In this manner, 300 mg. of material which is characterized by its NMR spectrum is obtained, m.p. C., identified as 4-(2-nitrophenylsulfenylamino)-4'-ureido-diphenyl sulfone.

EXAMPLE 4-( l -Methyl-l ,2-butenyl-3-one )-amino-4 ureido-diphenyl sulfone A 2 g. portion of 4-(sulfanilyl)phenyl urea is stirred for 12 hours in 20 ml. of 2,4-pentanedione in the presence of a few mg. of 2,4-dinitrobenzene sulfonic acid. The resultant precipitate is collected on a filter and recrystallized from 35 ml. of 2,4-pentanedione to give 1.2 g. of product, 4-(1-methyl-l,2-butenyl-3-one)- amino-4'-ureido-diphenyl sulfone, m.p. 204207d.

What is claimed is:

l icornpgund having the formula: 

